Battery charger



FIG. 1 is a perspective view of a battery charger;

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a right-side view thereof;

FIG. 5 is a left-side view thereof;

FIG. 6 is a rear view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines present in the drawings are included for the purpose of illustrating portions of the article or environmental subject matter which form no part of the claimed design. 

CLAIM The ornamental design for a battery charger, as shown and described. 